1)A book most commonly read by teenage girls ranging in age between 11 and 19. The book itself is an incredulously pointless book about a romance between a vampire and a human. The book is poorly written and was now made into a movie to bring in millions of easily amused girls money across America.

2)Also referring to the period of enlightment one experiences when they realize the book is crap.

3)A Harry Potter spin-off.

girl 1: "Like oh my god, I just started reading Twighlight! It has to be the best book ever written!"
girl 2: "Yeah your definitely right! It's like more popular than the bible!"